function f(a, p) {
    a === undefined || a === null || p;
    a === undefined || a !== null || p;
    a !== undefined || a === null || p;
    a !== undefined || a !== null || p;
    (a === undefined && a === null) || p;
    (a === undefined && a !== null) || p;
    (a !== undefined && a === null) || p;
    (a !== undefined && a !== null) || p;
}
